For the second time this year and at least the seventh time in recent memory, the Royal Bank of Scotland is about to cut a massive check as part of a settlement over the bank’s mortgage practices in the run-up to the housing crisis. Back in March, it was a $500 million settlement with the state of New York. Now, RBS is preparing for a nearly $5 billion settlement with the DOJ that would cover the bank’s issuance and underwriting of mortgage-backed securities between 2005 and 2007.